|Property|Test method|units|4275|4301|4435|4630|4645|
|---|---|---|---|---|---|---|---|
|Tensile Strength|ASTM D 638|MPa (kpsi)|117 (16.9)|113 (16.4)|94 (13.6)|81 (11.8)|114 (16.6)|
|Tensile Modulus|ASTM D 638|GPa (kpsi)|8.8 (1,280)|6.8 (990)|14.5 (2,100)|7.4 (1,080)|18.6 (2,700)|
|Tensile Elongation|ASTM D 638|%|2.6|3.3|1.0|1.9|0.8|
|Flexural Strength|ASTM D 790|MPa (kpsi)|208 (30.2)|215 (31.2)|152 (22.0)|131 (19.0)|154 (22.4)|
|Flexural Modulus|ASTM D 790|GPa (kpsi)|7.3 (1.060)|6.9 (1,000)|14.8 (2,150)|6.8 (990)|12.4 (1,800)|
|Compressive Strength|ASTM D 695|MPa (kpsi)|123 (17.8)|166 (24.1)|138 (20.0)|99 (14.4)|157 (22.8)|
|Izod Impact Strength, Notched|ASTM D 256|J/m (ft-lb/in)|85 (1.6)|64 (1.2)|43 (0.8)|48 (0.9)|37 (0.7)|
|Izod Impact Strength, Unnotched|ASTM D 4812|J/m (ft-lb/in)|270 (5)|430 (8)|210 (4)|160 (3)|110 (2)|
|Heat Deflection Temperature at 264 psi|ASTM D 648|°C (°F)|280 (536)|279 (534)|278 (532)|280 (536)|281 (538)|
|Coefficient Linear Thermal Expansion|ASTM D 696|ppm/°C (ppm/°F)|25 (14)|25 (14)|14 (8)|16 (9)|9 (3)|

Question: what are the number of times astm d 638 is listed as the test method?
Answer: 3